SU1522283A1 - Device for measuring slanting of tape record carrier - Google Patents

Abstract

The invention relates to a measurement technique, in particular, to devices for measuring the skew of a moving electrostatic tape information carrier, and can be used to determine the quality of the tape-recording mechanisms of a recording device. The aim of the invention is to improve the accuracy of the device. The skew in the device is measured by scanning in the forward and reverse directions across the carrier on which the pilot signal is applied as a sequence of potential lines located at an acute angle to the edge of the tape carrier. When scanning, pulses are generated at the moments of intersection of the pilot signal. The resulting time intervals are processed to determine the skew at various points along the width of the carrier. 1 il.

Description

The invention relates to the accumulation of information, namely, devices for measuring the skew of a tape recording medium.

The purpose of the invention is to improve the accuracy of measuring the skew of the recording medium.

The drawing shows one of the possible variants of the proposed device for measuring the skew of a tape recording medium.

The device contains a sweep generator 1 connected by an output to the deflecting system 2 of the cathode-ray tube 3, which is made flush with the metal-fiber screen and is installed against the counter electrode 4 connected through a resistor 5 to the common bus 6

and connected to the input of the amplifier, 7, the first and second comparators 8 and 9, the first and second sources 10 and 11 of the reference voltage, the element NOT 12, the first, second and third elements And 13, 14 and 15, the driver of the 16 pulses, the element OR 17, a counter 18, a code converter 19, a trigger 20, a pulse generation iTop 21 and a multi-vibrator 22. The output of amplifier 7 is connected to the first inputs of the first and second comparators 8 and 9 connected by the second inputs to the outputs of the first and second sources 10 and 11 reference voltages and connected outputs with the reset input of the trigger 20 and with the input of the element NO 12. The output of the element NOT 12 is connected to the

The first input of the first element 13, connected by the second input to the forward output of the trigger 20, the inverse output of which is connected to the first input of the second element 14 and connected to the input of the pulse former 16. The pulse generator 21 is connected to the output to the third input of the third element I 15, which is connected to the counting input of the counter 18, whose codes are connected to the converter inputs: 19 codes. In this case, the metal fiber one: the screen of the cathode ray tube 3 is mounted against the counter electrode 4 in such a way that a tape carrier 23 can be placed between them, on which the control signal is recorded in the form of an electrostatic field strip 24 inclined to its edge.

The device also contains a pulse distributor 25 connected by a counting input to the output of the first element AND 13, connected by a third input to the output of a waiting multivibrator 22, an additional trigger 26 connected by an output to the second input of the third element 15, connected by a setting input to the output of the first - a new comparator 8 connected to the input of the standby multivibrator and to the second input of the second element AND 14, and connected by a reset input to the output of the element OR 17 connected to the second input of the second element And 14, with the installation m trigger input 20, with the reset input of the counter 18 and with the start input of the sweep generator 1, the subconnecting control of the 1M input to the forward output of the trigger 20, a key 27 through which the output of the driver 16 is connected to the first input of the element OR 17, connected by a second input to the input bus 28 of the start signal, and display units 29, each of which is provided with an additional element AND 30, an additional element OR 31, an additional waiting multivibrator 32, a second additional trigger 33 and a register 34. In each block 29 mapping and the first input of the additional element I 30 is connected to the output of the element NO 12 connected to the reset input of the second additional trigger 33. The second additional trigger 33 is connected by a setting input to the output of the additional waiting multi-vibrator 32 and connected to the output to the second input of the additional element I 30 connected output with the first input of an additional element ШШ 31, Additional element ШШ 31 is connected by the second input to the output of the pulse shaper 16 and is connected to the third input with one of the outputs 25 pulses, connected to the start input of an additional standby multivibrator 32, connected by information inputs to the outputs of the converter 19 code. The output of the additional element OR 31 is connected to the synchronization input of the register 34 connected to the inputs of the computing unit and connected by information inputs to the outputs of the counter 18. At the same time, the reset input of the distributor

25 pulses are connected to the output of the element OR 17.

The operation of the proposed device for measuring the skew of the tape recording medium occurs as follows.

During the measurement process, a tape recording medium 23, such as an electrostatic recording tape, is moved between the metal fiber screen of the cathode ray tube 3 and the counter electrode 4. At the beginning of the measurement, the start signal on the input bus 28 triggers a start signal, which, through the OR element 17, starts the sweep generator 1 and sets the one and zero states respectively to the trigger 20 and the additional trigger

26 and the initial state of the counter 18 and the distributor 25 pulses. At the start signal, the sweep generator 1 produces a linearly increasing voltage applied to the deflecting system 2 of the cathode ray tube 3, the beam of which begins to scan across the electrodes of the fiberglass screen, located across the width of the tape carrier 23 of the recording. When the beam hits the electrodes of the metal-fiber screen, their potential sharply increases to the value of the voltage gap of the air gap between the cathode-ray tube 3 and the tape carrier 23 of the recording. As a result, a breakdown occurs, ensuring transfer of electrostatic charge to the tape carrier 23, which flows down the circuit.

from the tape carrier 23 of the recording, the counter electrode A, the resistor 5 and the common bus 6. On the resistor 5, a voltage appears proportional to the potential difference of the electrodes of the metal screen and the sections of the tape carrier 23 of the recording. When the beam crosses the cathode-ray tube 3

18 records a number characterizing the scan time from the start of the sweep until the reproduction of the pilot signal of the recording medium 23. Distributor pulse 25 pulses also triggers an additional pending multivibrator excited by code converter 19

metal screen electrodes,., about 32, forming a pulse, which, by the leading front, sets the second additional trigger 33 into a single state, which ensures the opening of an additional element AND

opposite the control signal in the form of a strip 24 of the electrostatic-1 field, short pulses are generated on the resistor 5, passing through

the amplifier 7 to the first and second compa- tors, 5-30. At the same time, the impulse from the element NOT 12 rators 8 and 9. The first comparator 8 in accordance with the reference voltage from the first source 10 of the reference voltage generates impulses

20

the beam on the recording tape carrier 23, which, during forward scanning, installs an additional trigger 26 in one state at the front edge, which ensures that the resolving potential arrives at the third element I 15. At the same time, the counter 18 starts counting the time of the ray of the cathode ray tube 3 along the tape record carrier 23 by counting the number of pulses of the generator 21 pulses. The second comparator 9, in accordance with the reference voltage from the second source 11 of the reference voltage, at the moments when the cathode ray tube 3 intersects the test signal of the recording tape carrier 23, generates pulses passing through the element HE 12 to the first element 13 and to which also resolving potentials from trigger 20 and from a standby multivibrator 22, triggered by the leading edge of a pulse from the first comparator 8. From the output of the first element I 13 to the distributor 25 pulses come from a series of pulses crossing m cathode-ray tube 3 pilot carrier belt 23 at the forward recording scan. The pulses of this series are fed to the additional elements from the respective outputs of the distributor 25 pulses. OR 31 and additional pending multivibrators 32 display units 29.

In each display unit 29, a pulse from the corresponding output of the distributor 25 pulses passes through an additional element OR 31 to the register 34, into which the counter

25

thirty

35

40

45

50

55

passes through an additional element AND 30 and an additional element OR 31 to a register 34, in which it writes down a number characterizing the time from the start of the sweep to the moment of reproduction of the control signal during the reverse scan. On the trailing edge of the pulse of the additional waiting I multivibrator 32, the second additional trigger 33 is again set to the zero state.

. , s when switching directions

scanning the leading edge of the pulse from the output of the first comparator 8 sets the trigger 20 to the zero state, from the inverse output of which the second element And 14 receives level 1. In this case, from the output of the second element. And 14 to the pulse shaper 16. A pulse is applied that is equal in duration to the scanning time of the beam of the cathode ray tube 3 on the tape recording medium 23 in the reverse direction. On the falling edge of this pulse, the pulse shaper 16 generates a short pulse in the display units 29 through the additional element OR 31 passes to the register 34. In this case, the number that characterizes the time from the start of scanning in the forward direction to the end of scanning in the opposite direction is written to the register 34. The pulse shaper 16 pulses provides for the restarting of the generator 1 sweep through the element OR 17 in case the key 27 is closed.

Claims (1)

Invention Formula An apparatus for measuring the skew of a tape recording medium comprising a sweep generator connected by an output to a deflection system 18 records a number characterizing the scan time from the start of the sweep until the reproduction of the pilot signal of the recording medium 23. Distributor pulse 25 pulses also triggers an additional pending multivibrator excited by code converter 19 32, a forming pulse, which by the leading edge sets the second additional trigger 33 into a single state, which ensures the opening of an additional element AND 30. In this case, the pulse from the element is NOT 12 30. In this case, the pulse from the element is NOT 12 passes through an additional element AND 30 and an additional element OR 31 to a register 34, in which it writes down a number characterizing the time from the start of the sweep to the moment of reproduction of the control signal during the reverse scan. On the falling edge of the pulse of the additional waiting I multivibrator 32, the second additional trigger 33 is again set to the zero state. . , s when switching directions scanning the leading edge of the pulse from the output of the first comparator 8 sets the trigger 20 to the zero state, from the inverse output of which the second element And 14 receives level 1. In this case, from the output of the second element. And 14 to the pulse shaper 16. A pulse is applied that is equal in duration to the scanning time of the beam of the cathode ray tube 3 on the tape recording medium 23 in the reverse direction. On the falling edge of this pulse, the pulse shaper 16 generates a short pulse, which in display units 29 through the additional element OR 31 passes to register 34. In this case, a number is recorded in register 34 characterizing the time from the start of scanning in the forward direction to the end of scanning in the opposite direction . The pulse shaper 16 pulses provides for the restarting of the generator 1 sweep through the element OR 17 in case the key 27 is closed. Invention Formula An apparatus for measuring the skew of a tape recording medium comprising a sweep generator connected by an output to a deflection system cathode ray tube made with a metal fiber screen and installed against a counter electrode connected via a common bus resistor and connected to the input of an amplifier whose output is connected to the first inputs of the first and second comparators connected by the second inputs to the outputs of the first and second reference voltage sources, respectively and the connected outputs, respectively, with the reset input trigger and with the input of the element NOT connected by the output to the first input of the first element I connected by the second in by moving to the forward output of the trigger, the inverse output of which is connected to the first input of the second element And connected to the input of the pulse generator, a pulse generator connected by the output to the first input of the third element And connected to the counter input of the counter, the outputs of which are connected to the inputs of the code converter , the OR element, the collapsed multivibrator and the input bus of the start signal, are due to the fact that, in order to improve the accuracy of the skew measurement, a pulse distributor is inserted into it, connected by the counting input to the output of the first element And, (Connected by the third input to the output of the waiting multivibrator, an additional trigger connected to the output of the second input of the third element And connected to the input of the first comparator connected to the input of the waiting multivibrator and the second input of the second element And, and the connected reset input to the output 0 five 0 five 0 five 0 an OR element connected to the second input of the second element AND, with a set trigger input, with a counter reset input and with a trigger generator input connected to the forward trigger trigger output by a control input, through which the pulse driver output is connected to the first the input of an OR element connected by a second input to the input bus of the start signal, and display units, each of which is equipped with an additional AND element, an additional OR element, an additional waiting multivibrator, a second additional element trigger and register, the reset input of the pulse distributor is connected to the output of the OR element, and in each display unit the first input of the additional element AND is connected to the output of the HE element connected to the reset input of the second additional trigger connected by the installation input to the output of the additional standby multivibrator and connected output to the second input of an additional element And, the output of which is connected to ;, the first input of an additional element OR, connected by a second input to the output pulse generator and a third distributor connected to one of the outputs of a pulse distributor connected to the start input of an additional standby multivibrator under- connected by information inputs to the outputs of the code converter, and the output of the additional element OR connected to the clock input of the register connected to the information inputs to the outputs , counter, Compiled by Yu. Rosenkrants Editor M.Tovtin Tehred M.Hodanich Proofreader O. Kravtsova Order 6970/50 Circulation 558 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Subscription